Propeller



June 28, 1949. w, w T v 2,474,562

PROPELLER 4 Filed March .50, 1945 vE/vmz. William fer ua Z.

ATTORNEY Patented June 28, 1949 UNITED STATES PATENT OFFICE PROPELLER William Waterval, Brooklyn, N. Y. Application March 30, 1945, Serial No. 585,657

1 Claim.

This invention relates to new and useful improvements in the construction of propellers, applicable wherever propellers are to be used; and it has for its specific object to provide a propeller blade, which due to its construction will prove sturdy in operation, easily adjustable as to pitch, and which will also permit of an easy replacement of said blade in case of damage.

With the above and other objects in view, this invention consists of the novel features of construction, combination and arrangement of parts, hereinafter fully described, claimed and il-' lustrated in the accompanying drawing, forming part of this specification, and in which similar characters of reference indicate corresponding parts in all views, and in which:

Figure 1 is a front elevational view of a propeller constructed according to my invention.

Figure 2 is a top plan view of a propeller hub and blades.

Figure 3 is a transverse sectional view, taken on the line 33 of Figure 2.

Figure 4 shows a propeller blade attached to a hub, partly in section and partly in elevation.

Figure 5 shows a side elevation of the major part of a propeller blade; while Figure 5a shows in side elevation an auxiliary blade, or thrustplate, attached to the former blade.

Figure 6 is a detail view showing a wedge used in fastening the propeller blade in position; whil Figure 7 is a detail view of a locking wedge for solidly securing the relevant parts together.

Figure 8 is a view similar to Figure 4, but showing a modification in the construction of the propeller blade.

Referring more particularly to the drawing, the numeral l indicates a propeller having the hub II and blades l2, l2. The hub is formed with grooves l3, l3 of a dovetailed nature, and the blades l2 are inserted in said grooves and held in place by wedges l4 and locking members I5, whereupon said parts are welded together and to the hub proper, as shown at l6.

As shown in Figure 4, the propeller blade consists herein of a large or major blade portion H, which has its bottom portion enlarged and slantingly bent, as shown at l8 in Figure this bottom portion 3 is made to fit in one side of In the modification shown in Figure 8, a plurality of blade sections, [1, Ha, I'lb, l'lc, substantially flat and of different sizes are staggeredly and fixedly secured together in any suitable manner, such as by welding, or riveting; the said blade ll shown in Figure 8 has then. all its blade sections slantingly bent, as shown at 26 in Figure 8, so that they will snugly fit in one side of the recessed hub portion, or groove l3; the fastening operation of said blade, or blade sections, is then the same as formerly described with respect to the blade shown in Figure 4, with the exception that in the relative arrangement shown in Figure 8 an additional wedge I4 is used to fasten the blade shown in said latter figure.

It is obvious that changes may be made in the form, construction and arrangement of the several parts, as shown, within the scope of the appended claim, without departing from the spirit of the invention, and I do not, therefore, wish to limit myself to the exact construction and arrangement shown and described herein.

What I claim as new, and desired to secure by Letters Patent of the United States, is:

The combination of a propeller blade with a recessed hub portion, said propeller blade comprising a major blade having its bottom portion enlarged and slantingly bent, said hub portion being formed with grooves therein, the enlarged portion of the major blade being mounted against one side of one of said grooves, a wedge arranged against the opposite side of said groove, and a locking member disposed between the wedge and said blade, whereby to secure the latter solidly in position, said wedge, locking member and blade being welded solidly together to form a unit, a second blade, slightly bevelled to form a streamlined surface, beingwelded to the major blade,

40 said major blade and second blade being welded a groove l3, when the said blade portionll is inserted in the same. Opposite the blade portion H in the other side of the groove IS a wedge I4 is inserted, while still another wedge, or locking member I5 is inserted between said first wedge and the blade portion to keep the latter solidly in position; the said parts are then welded together, whereupon a second blade portion [9, slightly beveled, as shown in Figure 5a, is welded to the major blade portion I1, and the two blade portions, 11 and I9, subsequently welded to the hub proper, as shown especially at It in Figure 4.

to the hub portion proper, substantially as shown and described.

WILLIAM WATERVAL.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,166,630 Lovekin Jan. 4, 1916 1,419,927 Hodgkinson June 20, 1922 FOREIGN PATENTS Number Country Date 343,170 Italy Sept. 16, 1936 428,999 France Sept. 12, 1911 552,692 France Jan. 26, 1923 

